List of ECMAScript engines

An ECMAScript engine is a program that executes source code written in a version of the ECMAScript language standard, for example, JavaScript.

These are new generation ECMAScript engines for web browsers, all implementing just-in-time compilation (JIT) or variations of that idea. The performance benefits for just-in-time compilation make it much more suitable for web applications written in JavaScript.

SpiderMonkey: A JavaScript engine in Mozilla Gecko applications, including Firefox. The engine currently includes the IonMonkey and JägerMonkey compilers, has previously included the TraceMonkey compiler (first javascript JIT), and is planned to include the forthcoming OdinMonkey compiler.

The following engines use runtime interpreters, which do not compile into native machine code and generally run more slowly.

Continuum:[7] A self-interpreter that supports recent iterations of the draft ECMAScript 6 specification.[8] Uniquely, the engine is implemented in ECMAScript 3, which makes it possible to run ES6 in browsers as old as IE6.[9]

Futhark: The ECMAScript engine of the Opera web browser versions 9.50 to 10.10.

YAJI: An ECMAScript engine[10] based on the FESI[11] implementation by Jean-Marc Lugrin in 1999, using the Java platform, currently being developed to support the latest standards (Spec 262, v5.1).[12]